so im going to get my shotgun today, what should i get for shells? slugs? birdshot? an assortment? i live in a townhome, but the layout is such that while im in my bedroom looking down the hall and stairs i see the front door, and there is brickwall behind door, so if i were to aim from room, if it were to penetrate wall it would be the wall facing the parking lotwhich is bricked 4 feet from ground level.